Troubleshooting - Samoa MP30 Parts And Technical Service Manual

MAINTENANCE
REPLACING CAM ASSEMBLY O-RING
Disassemble valve first as described in the previous section.
Then unscrew the screws of the lock pawl (4) and the cam (5) to remove the
trigger (6).
To avoid damaging the o-rings, push out the cam (7) on one side until only the
o-ring of that side (8) is visible. Remove the o-ring and then fully remove the cam
with the other o-ring (9) on the opposite site.
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TROUBLESHOOTING

Problem Cause
Blocked strainer.
No fluid passing
through the meter.
Dirt particles jamming the wetted parts rotors.
Blocked strainer.
Low flow rate.
Low oil supply pressure
Dirt in chamber.
Low accuracy
Any parts of metering chamber are worn or damaged.
Valve will not close Foreign material on valve seal. Valve seal worn or damaged.
Leaking at nozzle Nozzle is open. O-rings worn or damaged.
Leakage at cam O-rings worn or damaged.
The swivel is loose.
Leakage at swivel
Swivel o-ring worn or damaged.
Packing gland leak. O-rings worn or damaged.
(*) To replace the complete metering chamber assembly and packing gland kit contact tech support.
SAMOA Industrial, S.A. · Pol. Ind. Porceyo, I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com
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To assembly, proceed the other way around taking care with the o-ring
of the cam.
To avoid damage to the o-rings in the cam assembly, it must be mounted a
single ring (9) on cam (7) and then place the cam in the gun by the end
without o-ring. Push gently the cam until the end without o-ring appears on
the side of the gun, with special care that only the groove of the o-ring poke
out. Introduce the o-ring (8) and place the shaft in position.
Solution
Remove the strainer and clean any dirt particles.
Replace if necessary.
Dismantle wetted parts of the meter assembly and clean.
Remove the strainer and clean any dirt particles.
Replace if necessary.
Increase oil supply pressure.
Dismantle metering chamber assembly and clean.
(*) Replace the complete metering chamber assembly.
Disassembly the valve for inspection.
If it is not damaged clean seat valve, otherwise replace the valve.
Manually close the nozzle. Replace nozzle.
Replace o-rings.
Tighten swivel assembly.
Replace o-ring.
(*) Replace packing gland kit.
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